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I have a headlight I get from Amazon that uses 2x 18650 batteries...
One can tell the difference between cheap and good batteries quickly...
The cheap ones hold up for an hour give/take...
The good ones hold up for 2.5-3 hours...
However the good ones take longer to charge... grin!

Didn't notice any strain on the pump tone. How was the run time or did it not make it to a recharge? They make some higher mah’s in the same style. I'm liking the lighter weight with the 3 cells.

When all 6 batteries were freshly charged it ran for an hour at home. Everything seemed normal.
I recharged the batteries and stuck it in the truck where it sat for about 10 days before I needed it. When I took it out to check for a leak on a condenser it didn’t act like it’s normal self.

PHM I mean to start and stop a timer to measure it this go round but got into it without. Felt like maybe 20 mins or less total with some days sitting in between. I'll get a timer going this next cycle.